Glass grinding and polishing machine



Oct. 16, 1951 I w, RQBB1NS 2,571,614

GLASS GRINDING AND POLISHING MACHINE Filed Sept. 14, 1950 I n vento r Waller Ray Ra bbins I as B). I 3.

Attorneys Patented Oct. 16, 1951 GLASS GRINDING AND POLISHING MACHINE Walter Roy Robbins, Norman, kla., assignor of twenty-five per cent to James L. Woods, Norman, Okla.

Application September 14, 1950, Serial No. 184,856

1 Claim. 1

An object of the present invention is to provide an improved glass grinding and polishing machine.

An object of the present invention is to provide a glass grinding and polishing machine employing a conventional wet grind glass belt wherein a backing means is provided for the belt so that the object being ground may be pressed against the belt at the portion supported by the backing means.

Still another object of the present invention is to provide a novel backing means which is formed of a pair of aluminum alloy plates with a sponge rubber insert therebetween, providing a resilient bearing backing means for the belt.

A further object of the present invention resides in the arrangement of the pulleys whereby the tensioning of the belt may be maintained.

A still further object of the present invention resides in the novel bucket arrangement for the machine whereby a grinding liquid may be sprayed against the grinding belt for lubricating the same, the liquid accumulating in the bucket and being drained therefrom.

Further objects of the present invention are to provide such means that are simple in construction, economical of manufacture and of general superiority.

Various other objects and advantages will become apparent from the detailed description to follow.

The best form in which I have contemplated applying my invention is clearly illustrated in the accompanying drawings, wherein: I

Figure l is a side elevational view of the glass grinding and polishing machine of the present invention;

Figure 2 is a horizontal transverse sectional view taken substantially along the plane of line 2-2 of, Figure 1;

Figure 3 is a side elevational view of a portion of the present invention showing the resilient mounting of the lower pulley; and

Figure 4 is a front plan view of the bucket means and resilient mounting for the lower pulley.

Referring more particularly to the accompanying drawings, wherein like numerals designate like parts throughout, the numeral I6 designates generally the stand for the present invention, the numeral [2 designates generally a guide means for the upper pulley and motor l4, the numeral [6 designates generally the back means, and the numeral l8 designates generally the bucket and spray means for the belt at the lower pulley, While the numeral 26 designates generally the resilient mounting arrangement for the lower pulley.

- The stand I6 is comprised of a pair of angle iron members 22 and 24 and a channel iron standard 26 to whichthe angle iron members 22 and 24 are secured at the lower end thereof.

At the upper end of the stand 16, a motor 28 and pulley 36 are mounted. Overlying the motor and pulley 28 and 36 is the guide means I 2 which includes an arcuated plate 32 an d angulated end 34. The angulated end 34 is secured to the channel iron beam 26 by means of the bolts 36 and nuts 38.

At an intermediate portion on the standard 26, a bucket means I8 is secured. The bucket means l8 includes a substantially rectangular crosssection housing 46 which has one vertical edge thereof secured to the standard 26 by means of the bolts 42. A supporting bar 44 is secured to the channel iron standard 26 and is attached to the bucket housing 46 by means of additional bolts 46.

One side wall of the bucket means I8 is provided with an arcuated slot 48. A second pulley 50 is mounted within the bucket means l8 with the shaft thereof extending through the arcuated slot 48. The outer portion of the shaft 52 of the second pulley 50 is received within the bearing means 54. The bearing means 54 is supported by means of a pair of brackets 56 which are pivotally mounted on plates 58 by means of the pins 60. The plates 58 are secured to the standard 26 by means of the bolts 62. A hook element 64 is integrally formed on the bearing housing 54 and a second hook element 66 is fixedly secured to the channel iron support. 26. A resilient coil spring 68 connects the two hooks 64 and 66 at 68 whereby the pulley shaft 52 will be resiliently maintained in its lowermost position. The hearing housing 54 may be provided with a grease adapter 10 for supplying grease to the bearings for the second pulley shaft 52.

The grinding belt 12 is of conventional form, being the wet-grind glass belt which is employed in many other grinding machines. The belt 12 is disposed over the upper pulley 36 and the second pulley 50, as shown best in Figure 1. It will readily be seen that the tautness of the belt 12 is controlled by the coil spring 68.

The backing means l6 includes an angulated supporting bar 14 which has one end thereof secured to the standard 26 by means of the bolts 16. The angulated free end 18 of the bar 14 has secured thereto a pair of aluminum alloy stop plates 80. Secured between the two aluminum alloy plates 80 is a sponge rubber insert 82. The outer aluminum plate 80 is in juxtaposition to the back of the grinding belt 12 whereby, when an object is pressed against the belt for grinding, the aluminum backing plate will provide a resilient bearing for the belt for most effective grinding.

A nozzle 84 is fixedly mounted within the front wall of the bucket housing l8 and has a liquid conduit 88 connected thereto for supplying liquid to the belt 12 for grinding purposes. A manually controlled valve 88 is positioned between the conduit 86 and the nozzle 84 for controlling the stream of fluid supplied to the belt 12. The

housing I8 is also provided with a drainage out-.

let 90 which may be connected to a reservoir for circulating back through the conduit 85.

From the foregoing description, taken in conjunction with the drawings, it is believed that a device has been provided which will accomplish all of the objects hereinabove set forth. It will also be readily seen that the belt 12 may readily be replaced by simply raising up on the bracket plate 56 against the resiliency of the spring 68 so that the pulley 50 no longer frictionally holds the belt 12 thereon. The belt 12 may then be removed and replaced.

Certain changes may be made in the construction and arrangement of the parts of my device eat departing from the real spirit and purpose, and it is my intention to cover by my claim any modified forms coming under the scope thereof.

Having described the claimed as new is:

invention, what is iU-shaped strap pivotally mounted on said shaft,

the end portion of the pulley shaft of said second pulley being rotatably journaled in the legs of said U-shaped strap, a sleeve rotatably received on said end portion of the shaft of the second pulley and between the legs of said U-shaped strap, and resilient means connected to said sleeve and a lower intermediate portion of said channeled member for tensioning said belt.

WALTER ROY ROBBINS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 804,902 Lyden Nov. 21, 1905 941,957 Schimmel Nov. 30, 1909 2,279,782 Fowler Apr. 14, 1942 2,367,107 Emmons Jan. 9, 1945 2,463,287 Krueger Mar. 1, 1949 2,527,003 Emmons Oct. 24, 1950 

